Brightness and Magnitude

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The brightness ratio between two celestial objects, the flux ratio, is defined as , where and are the apparent magnitudes of the objects. The magnitude scale is a much more convenient way to express brightness measurements than using actual brightness measurements that use much larger numbers. Brightness and magnitude are important introductory topics in basic astronomy.

Contributed by: Jeff Bryant (March 2011)
Open content licensed under CC BY-NC-SA




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